The book is available at your local bookstore and many online bookshops. In the Depths of Ice: Anne and Philipp must find the last secret of happiness and embark on a journey to the icy Antarctica. They join a research group to explore the land of penguins together. But suddenly, the siblings slip into a glacier crevice that leads them to an unknown realm.

Join Philipp and Anne in the icy world of Antarctica, the land of penguins! The popular children's book series by bestselling author Mary Pope Osborne is perfect for reading aloud and for independent reading. Siblings Anne and Philipp travel through time with the magical treehouse, discovering distant lands, fascinating animals, and experiencing thrilling adventures. With many detailed, colorful illustrations. For children aged 6 and up. All volumes of the series are listed on Antolin.